Friday Harbor Airport Weather Forecast

    • 48
    • 68

    Becoming Sunny

    • 49
    • 69

    Mostly Sunny

    • 51
    • 67

    Rain

    • 48
    • 69

    Chance Rain

    • 50
    • 67

    Chance Rain

    • 50
    • 68

    Chance Rain

Today 18 Sep San Juan County

Sunny. Highs in the mid 60s to lower 70s. Northwest wind to 10 Mph.

Tonight 18 Sep San Juan County

Clear. Lows in the upper 40s to mid 50s. Light wind.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Friday Harbor Airport Temperature Statistics

September Temperature

Friday Harbor Airport (0 miles)

  • Lowest 10 September, 2025

    48 °F

  • Average September

    58.1 °F

  • Highest 3 September, 2025

    75.9 °F

Climate (2020–Present)

Friday Harbor Airport (0 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    59.5 °F
Get WillyWeather+ to remove ads